some papers in Science Direct

http://www.sciencedirect.com/science/article/pii/S0360132308003028

http://www.sciencedirect.com/science/article/pii/S037877880700179X

http://www.sciencedirect.com/science/article/pii/S0960148103003987

http://www.sciencedirect.com/science/article/pii/S0378778807000965

http://www.sciencedirect.com/science/article/pii/S0378778811004129

http://www.sciencedirect.com/science/article/pii/S0378778812001491

http://www.sciencedirect.com/science/article/pii/S0196890411001348

http://www.sciencedirect.com/science/article/pii/S0378778810003191

http://www.sciencedirect.com/science/article/pii/S0378778808000352

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